comparison src/libid3tag-0.15.1b/ucs4.c @ 85:545efbb81310

Import initial set of sources

+/*
+ * libid3tag - ID3 tag manipulation library
+ * Copyright (C) 2000-2004 Underbit Technologies, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * $Id: ucs4.c,v 1.13 2004/01/23 09:41:32 rob Exp $
+ */
+
+# ifdef HAVE_CONFIG_H
+#  include "config.h"
+# endif
+
+# include "global.h"
+
+# include <stdlib.h>
+
+# include "id3tag.h"
+# include "ucs4.h"
+# include "latin1.h"
+# include "utf16.h"
+# include "utf8.h"
+
+id3_ucs4_t const id3_ucs4_empty[] = { 0 };
+
+/*
+ * NAME:	ucs4->length()
+ * DESCRIPTION:	return the number of ucs4 chars represented by a ucs4 string
+ */
+id3_length_t id3_ucs4_length(id3_ucs4_t const *ucs4)
+{
+  id3_ucs4_t const *ptr = ucs4;
+
+  while (*ptr)
+    ++ptr;
+
+  return ptr - ucs4;
+}
+
+/*
+ * NAME:	ucs4->size()
+ * DESCRIPTION:	return the encoding size of a ucs4 string
+ */
+id3_length_t id3_ucs4_size(id3_ucs4_t const *ucs4)
+{
+  return id3_ucs4_length(ucs4) + 1;
+}
+
+/*
+ * NAME:	ucs4->latin1size()
+ * DESCRIPTION:	return the encoding size of a latin1-encoded ucs4 string
+ */
+id3_length_t id3_ucs4_latin1size(id3_ucs4_t const *ucs4)
+{
+  return id3_ucs4_size(ucs4);
+}
+
+/*
+ * NAME:	ucs4->utf16size()
+ * DESCRIPTION:	return the encoding size of a utf16-encoded ucs4 string
+ */
+id3_length_t id3_ucs4_utf16size(id3_ucs4_t const *ucs4)
+{
+  id3_length_t size = 0;
+
+  while (*ucs4) {
+    ++size;
+    if (*ucs4 >= 0x00010000L &&
+	*ucs4 <= 0x0010ffffL)
+      ++size;
+
+    ++ucs4;
+  }
+
+  return size + 1;
+}
+
+/*
+ * NAME:	ucs4->utf8size()
+ * DESCRIPTION:	return the encoding size of a utf8-encoded ucs4 string
+ */
+id3_length_t id3_ucs4_utf8size(id3_ucs4_t const *ucs4)
+{
+  id3_length_t size = 0;
+
+  while (*ucs4) {
+    if (*ucs4 <= 0x0000007fL)
+      size += 1;
+    else if (*ucs4 <= 0x000007ffL)
+      size += 2;
+    else if (*ucs4 <= 0x0000ffffL)
+      size += 3;
+    else if (*ucs4 <= 0x001fffffL)
+      size += 4;
+    else if (*ucs4 <= 0x03ffffffL)
+      size += 5;
+    else if (*ucs4 <= 0x7fffffffL)
+      size += 6;
+    else
+      size += 2;  /* based on U+00B7 replacement char */
+
+    ++ucs4;
+  }
+
+  return size + 1;
+}
+
+/*
+ * NAME:	ucs4->latin1duplicate()
+ * DESCRIPTION:	duplicate and encode a ucs4 string into latin1
+ */
+id3_latin1_t *id3_ucs4_latin1duplicate(id3_ucs4_t const *ucs4)
+{
+  id3_latin1_t *latin1;
+
+  latin1 = malloc(id3_ucs4_latin1size(ucs4) * sizeof(*latin1));
+  if (latin1)
+    id3_latin1_encode(latin1, ucs4);
+
+  return release(latin1);
+}
+
+/*
+ * NAME:	ucs4->utf16duplicate()
+ * DESCRIPTION:	duplicate and encode a ucs4 string into utf16
+ */
+id3_utf16_t *id3_ucs4_utf16duplicate(id3_ucs4_t const *ucs4)
+{
+  id3_utf16_t *utf16;
+
+  utf16 = malloc(id3_ucs4_utf16size(ucs4) * sizeof(*utf16));
+  if (utf16)
+    id3_utf16_encode(utf16, ucs4);
+
+  return release(utf16);
+}
+
+/*
+ * NAME:	ucs4->utf8duplicate()
+ * DESCRIPTION:	duplicate and encode a ucs4 string into utf8
+ */
+id3_utf8_t *id3_ucs4_utf8duplicate(id3_ucs4_t const *ucs4)
+{
+  id3_utf8_t *utf8;
+
+  utf8 = malloc(id3_ucs4_utf8size(ucs4) * sizeof(*utf8));
+  if (utf8)
+    id3_utf8_encode(utf8, ucs4);
+
+  return release(utf8);
+}
+
+/*
+ * NAME:	ucs4->copy()
+ * DESCRIPTION:	copy a ucs4 string
+ */
+void id3_ucs4_copy(id3_ucs4_t *dest, id3_ucs4_t const *src)
+{
+  while ((*dest++ = *src++))
+    ;
+}
+
+/*
+ * NAME:	ucs4->duplicate()
+ * DESCRIPTION:	duplicate a ucs4 string
+ */
+id3_ucs4_t *id3_ucs4_duplicate(id3_ucs4_t const *src)
+{
+  id3_ucs4_t *ucs4;
+
+  ucs4 = malloc(id3_ucs4_size(src) * sizeof(*ucs4));
+  if (ucs4)
+    id3_ucs4_copy(ucs4, src);
+
+  return ucs4;
+}
+
+/*
+ * NAME:	ucs4->putnumber()
+ * DESCRIPTION:	write a ucs4 string containing a (positive) decimal number
+ */
+void id3_ucs4_putnumber(id3_ucs4_t *ucs4, unsigned long number)
+{
+  int digits[10], *digit;
+
+  digit = digits;
+
+  do {
+    *digit++ = number % 10;
+    number  /= 10;
+  }
+  while (number);
+
+  while (digit != digits)
+    *ucs4++ = '0' + *--digit;
+
+  *ucs4 = 0;
+}
+
+/*
+ * NAME:	ucs4->getnumber()
+ * DESCRIPTION:	read a ucs4 string containing a (positive) decimal number
+ */
+unsigned long id3_ucs4_getnumber(id3_ucs4_t const *ucs4)
+{
+  unsigned long number = 0;
+
+  while (*ucs4 >= '0' && *ucs4 <= '9')
+    number = 10 * number + (*ucs4++ - '0');
+
+  return number;
+}